<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .parent{
            width: 300px;
            height: 300px;
            background-color: #ccc;
            /* 水平居中 */
            margin: 0 auto;
            display: flex;

        }
        .parent>div{
            width: 120px;
            height: 60px;
        }
        
        .parent>div:nth-child(2){
           /* flex-shrink父容器的空间不足一放下所有弹性元素
           会进行更比例压缩 默认值为1
           弹性元素不想进行压缩 0
           */
           flex-shrink: 0;
        }
       
        
    </style>
</head>
<body>
    <div class="parent">
        <div class="div1" style="background-color: red;">弹性元素1</div>
        <div class="div2" style="background-color: green;">弹性元素2</div>
        <div class="div3" style="background-color: blue;">弹性元素3</div>
    </div>
</body>
</html>